Digestcreative-strategy
Video length: what 6, 15 and 30 seconds each do
By Leila Fernandez, Managing Editor — Archive date: 2 min read
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Six seconds sells a hook, fifteen sells a mechanic, thirty still wins on rewarded inventory. Length is a placement decision, not a creative preference.
Length isn't a creative choice. It's a placement decision, and once a team starts treating it as one, most of the confusion about why a cut that crushed on one network died quietly on another tends to resolve itself.
A six-second cut holds exactly one idea, and that idea has to be the hook, landing before the viewer consciously decides whether to keep watching. It earns its keep where attention runs thin and the skip sits close: feed placements with fast scroll behaviour, mostly. Everything after the hook is footage nobody sees.
Fifteen seconds is where a mechanic gets demonstrated rather than implied. There's room for the hook, a clear beat showing what the player actually does, then a resolution or a call to action. Most creative teams should default to fifteen for standard feed and interstitial placements, because that length proves the game does what the hook promised without asking for more attention than a viewer will hand an ad.
Thirty seconds looks outdated on paper. It still performs on rewarded video, where the viewer has opted in for a defined reward and isn't deciding moment to moment whether to stay. That commitment changes what a cut can do: it can build tension, run a short story beat, show a fuller loop of the mechanic, whatever the concept needs, because the platform has already solved the attention problem on the advertiser's behalf. Run the same thirty-second cut in a skippable feed placement and it usually loses to a fifteen-second version of the same concept. It's chasing attention nobody granted it.
For a briefing document the rule fits in one line: match length to the guarantee the placement gives you. Where there's no guarantee you have six seconds of hook and nothing else. A short guaranteed view buys fifteen, with one beat properly demonstrated. A full opted-in view puts thirty on the table, and sometimes thirty is the better use of the slot. An earlier piece here, The Q4 creative calendar: when to lock, when to test, made a similar point about matching creative decisions to what a placement actually promises rather than to a house style; length is the clearest place that discipline pays off.
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